Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 551 [Rate centres in NPA 551] [Dial plan for NPA 551]

NXX: 210

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
551-210 A Dumont NJ NBWKNJ17DS1  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 224      
551-210 0 Dumont NJ PSWYNJBXDS0  999H BLUEBIRD COMMUNICATIONS, LLC - NJ 224   2018-09-19   
551-210 1 Dumont NJ JRCYNJ65DS4  264F PEERLESS NETWORK OF NEW JERSEY, LLC - NJ 224   2018-11-30   
551-210 2 Dumont NJ NWRKNJMDDSK  637C ONVOY, LLC - NJ 224   2020-08-15   
551-210 3 Dumont NJ NBWKNJ17DS1  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 224   2017-07-29   
551-210 4 Dumont NJ NWRKNJMDDSK  637C ONVOY, LLC - NJ 224   2020-08-15   
551-210 5 Dumont NJ JRCYNJ658MD  197D VONAGE AMERICA LLC 224   2020-07-24   
551-210 6 Dumont NJ JRCYNJ658MD  197D VONAGE AMERICA LLC 224   2020-07-24   
551-210 7 Dumont NJ NWRKNJMDDSK  637C ONVOY, LLC - NJ 224   2020-10-19   
551-210 8 Dumont NJ NWRKNJMDDSK  637C ONVOY, LLC - NJ 224   2019-05-06   
551-210 9 Dumont NJ NWRKNJMDDSK  637C ONVOY, LLC - NJ 224   2019-05-06   

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.